deepseek-ai/deepseek-harness · error · Error

PTY send aborted before write

Error message

PTY send aborted before write

What it means

Error "PTY send aborted before write" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/terminal/terminal-bash/src/session.ts:236

      signal?.throwIfAborted()
      throw error
    } finally {
      this.initializing = false
    }
  }

  startSend(request: TerminalSendRequest): TerminalSendOperation {
    if (this.closing) throw new Error('PTY session is closing')
    if (this.statusValue.kind === 'exited') throw new Error('PTY session has exited')
    if (this.active !== undefined) {
      const draining = this.activeWrite !== undefined
        ? ' or draining provider write'
        : this.interrupting !== undefined
          ? ' or draining foreground interrupt'
          : ''
      throw new TerminalError(`PTY session already has an active send${draining}`, 'SEND_ACTIVE')
    }
    if (request.signal?.aborted === true) throw new Error('PTY send aborted before write')

    const operation = new LocalSendOperation(
      this.config.maxReadBytes,
      Date.now(),
      () => { this.interrupt(operation) },
    )
    this.active = operation
    this.resetReadinessEvidence()

    if (request.signal !== undefined) {
      const onAbort = (): void => { operation.cancel() }
      request.signal.addEventListener('abort', onAbort, { once: true })
      this.activeAbort = () => request.signal?.removeEventListener('abort', onAbort)
    }
    this.activeDeadlineTimer = setTimeout(() => {
      if (this.active === operation) {
        this.settleActive('timeout', this.activeWrite !== undefined || this.interrupting === operation)
      }

View on GitHub (pinned to b150a551b8)

Solutions

1. Do not abort before the write, or retry the send after the abort.

When it happens

Trigger: Thrown at packages/terminal/terminal-bash/src/session.ts:236 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/9097d7e7ed1d2620. Report an issue: GitHub.